Ground truthing. Fieldwork was conducted in Pedro Peixoto and Theobroma. We interviewed individual farmers regarding their land management practices.
Ground Truth - Information collected from a survey area as remote sensing data is being collected from the same area (see control).
H
Hierarchical - A way of classifying data, starting with the general and going to specific labels.
ground truth p. 121 a determination of geographic attributes judged to be of higher accuracy; usually applied to a 'point' classified into a land use/land cover category. H
'heads-up' digitizing p.
trainingmap=name ground truth training map
This map must be prepared by the user in advance. Programs like v.digit or r.digit can be used to define representative areas of the classes the user defines to be in the image.
Esri Ensures Data Accuracy
Learn how Esri's ground truth project improved the accuracy of its 2010/2015 demographic forecasts.
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Taylor, P.J. and Johnston, R.J. 1995. GIS and Geography. In J. Pickles (ed) Ground Truth. The social implications of Geographic Information Systems: 51-67. London: The Guilford Press.
___________., ed. 1994. Ground Truth. New York: The Guilford Press.
Popper, K. 1959. The Logic of Scientific Discovery. New York: Basic Books.
Referenced by: Pixel Factory; Landsat 7; Accuracy and precision; Quality assurance; Sensor; Sensitivity analysis; Pixel; Ground truth; Calibration; Atomic clock; Advanced Very High Resolution Radiometer; Theodolite.
Perhaps the best method of evaluation is verification through Ground Truthing, which entails actually visiting places represented in your model and confirming whether or not the qualities predicted by your model are in fact happening.
and disadvantages for a particular map projection will often help in which map to choose for a particular project. The basic problem inherent in any type of map projection is that it will result in some distortion of the ‘ground truth' of the ...
A good example from the late 1980's was the Ordnance Survey's first digital maps, where the absolute positions of major roads shown at scales of 1:1250 and 1:2500 were sometimes a scale distance of hundreds of metres away from ground truth, ...
 See also: Image, Information, Area, Map, Analysis
  
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